Shared-bandwidth multiple target remote copy

• US 9,715,477 B2
• Filed: 11/24/2015
• Issued: 07/25/2017
• Est. Priority Date: 09/03/2009
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Wilkinson, John P.
• Primary Examiner(s): Sciacca, Scott M
• Application Number:
  US14/951,292
• Publication Number:
  US 20160077743A1
• Time in Patent Office: 609 Days
• Field of Search: 709216, 709217, 709219, 709245
• CPC Class Codes: G06F 11/2058 using more than 2 mirrored copies
• CPC Class Codes: G06F 11/2066 Optimisation of the communication load
• CPC Class Codes: G06F 15/17306 Intercommunication techniques
• CPC Class Codes: G06F 2206/1012 Load balancing
• CPC Class Codes: G06F 3/0604 Improving or facilitating administration, e.g. storage management
• CPC Class Codes: G06F 3/0613 in relation to throughput
• CPC Class Codes: G06F 3/0635 by changing the path, e.g. traffic rerouting, path reconfiguration
• CPC Class Codes: G06F 3/065 Replication mechanisms
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

In one embodiment, a method is provided for sharing bandwidth in a data processing system having a plurality of locations. The method includes splitting data into a plurality of data elements. The method also includes sending, from a sender, each one of the plurality of data elements to a different location selected from the plurality of locations. The method further includes sending a message from the sender to each of the locations receiving one of the data elements, where the message is sent from the sender separate from the data elements. The message includes information about the data elements, and for each location receiving one of the data elements, an address of the location. The message includes all of the addresses of all of the locations of the plurality of locations receiving one of the data elements of the data.

Claims

1. A method for sharing bandwidth in a data processing system having a plurality of locations, the method comprising:

splitting data into a plurality of data elements;

sending, from a sender, each one of the plurality of data elements to a different location selected from the plurality of locations, wherein each data element is different; and

sending a message from the sender to each of the locations receiving one of the data elements, wherein the message is sent from the sender separate from the data elements, and the message includes;

information about the data elements, and

for each location receiving one of the data elements, an address of the location,

wherein the message includes all of the addresses of all of the locations of the plurality of locations receiving one of the data elements of the data;

wherein the data is split into the plurality of data elements at a disk level, such that a storage system copying a plurality of disks splits a first half of the disks into a first one of the data elements, and splits a second half of the disks into a second one of the data elements.

2. The method of claim 1, wherein the data is split into equal size data elements.

3. The method of claim 1, wherein the data elements are sent to each location alternately.

4. A computer program product for performing the method of claim 1, the computer program product comprising:

a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising;

computer readable program code configured to split the data into the plurality of data elements;

computer readable program code configured to send each one of the plurality of data elements to a different location selected from the plurality of locations; and

computer readable program code configured to send the message to each of the locations.

5. The method of claim 1, further comprising receiving a second data element split from second data from one of the locations;

receiving a second message from the one of the locations; and

sending the second data element to another of the locations identified in the second message.

6. The method of claim 5, further comprising receiving a third data element split from the second data;

and combining the second and third data elements for recreating the second data; and

storing the second data after recreation thereof.

7. The method of claim 1, wherein the data element sent to each unique location is different than the data elements sent to the other locations.

8. A method for sharing bandwidth in a data processing system having a plurality of locations, wherein the plurality of locations comprises a first location and plurality of further locations, the method comprising:

receiving a first data element of first data from the first location and other data elements of the first data from the further locations, wherein each data element of the first data is different; and

receiving, after receiving the first data element of the first data from the first location, a message from the first location, wherein the message is sent from the first location separate from the first data element received from the first location, and the message comprises;

an address of each of the locations of the plurality of locations having one of the data elements of the first data, such that the message includes all of the addresses of all of the locations of the plurality of locations receiving one of the data elements of the first data;

wherein the first data has been split into the data elements of the first data at a disk level, such that a storage system copying a plurality of disks has split a first half of the disks into a first one of the data elements, and has split a second half of the disks into a second one of the data elements.

9. The method of claim 8, wherein the method further comprises receiving a second data element of the first data from one of the further locations.

10. The method of claim 9, wherein the method further comprises the step of combining the first data element with the second data element.

11. The method of claim 10, wherein the second data element is received from a different one of the locations than the first data element.

12. A computer program product for performing the method of claim 8, the computer program product comprising:

a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising;

computer readable program code configured to receive the first data element; and

computer readable program code configured to receive the message.

13. The method of claim 8, further comprising determining whether all of the data elements of the first data have been received from the plurality of locations, and further comprising combining the data elements of the first data for re-creating the first data upon determining that all of the data elements have been received.

14. The method of claim 13, wherein the first data remains stored at the first location and wherein the first data is recreated and stored locally.

15. The method of claim 8, further comprising:

splitting third data into a plurality of third data elements, wherein each third data element is different;

sending each one of the plurality of third data elements to a different location selected from the plurality of locations;

sending another message to each of the locations, wherein the other message is sent separate from the third data elements, and the other message includes;

information about the third data elements, and

for each location receiving one of the third data elements, an address of the location, such that the message includes all of the addresses of all of the locations receiving one of the third data elements.

16. The method of claim 15, wherein the message is configured to be used by each of the locations receiving one of the data elements and the message to:

determine the address of each of the locations receiving the other of the data elements from the first location, and

using the addresses in the message, send the data element received by the location to each location of the plurality of locations receiving the other of the data elements from the first location.

17. The method of claim 8, comprising receiving all of the data elements of the first data;

combining the received data elements thereby replicating the first data; and

storing the first data.